CN114557129A

CN114557129A - Lighting lamp and dimming control system

Info

Publication number: CN114557129A
Application number: CN202080073589.1A
Authority: CN
Inventors: 江口淳一; 浅井谦次
Original assignee: Nichia Corp
Current assignee: Nichia Corp
Priority date: 2019-10-30
Filing date: 2020-10-29
Publication date: 2022-05-27
Also published as: EP4054294A4; WO2021085546A1; US20210136891A1; JPWO2021085546A1; EP4054294A1

Abstract

The invention provides an illumination considering influence on a human body. The lighting fixture has: a first light-emitting device that emits light having a first chromaticity coordinate in a chromaticity diagram of a CIE1931 color system and has a high blackout pixel ratio, a second light-emitting device that emits light having a second chromaticity coordinate, and a third light-emitting device that emits light having a third chromaticity coordinate and has a low blackout pixel ratio, wherein light in a range from a first temperature to a second temperature on a blackbody radiation locus is included in a triangular region surrounded by a straight line connecting the first chromaticity coordinate and the second chromaticity coordinate, a straight line connecting the second chromaticity coordinate and the third chromaticity coordinate, and a straight line connecting the third chromaticity coordinate and the first chromaticity coordinate.

Description

Lighting lamp and dimming control system

Technical Field

The invention relates to an illumination lamp and a dimming control system.

Background

Lighting is an essential element in buildings such as offices, factories, commercial facilities, and homes. The illumination is used for illuminating places of various activities of people such as work, shopping, or reunion.

In the prior art, for such indoor illumination, the excellence of luminous efficiency and the high degree of color rendering are important parameters for evaluating the performance of the illumination. Patent document 1 discloses a light-emitting device having high color rendering properties with an average color rendering evaluation number of 90 or more.

On the other hand, in recent years, there is a trend to consider the influence on the human body in forming a work environment for a person. For example, in a WELL certification Standard (WELL certification Standard) certification system established by iwbi (international WELL certification institute), buildings such as offices are evaluated from a plurality of items such as air, water, food, light, and comfort, and certification is given by satisfying a criterion.

For example, as for the light items in the WELL authentication, evaluation items that are necessary for consideration of visual environment, consideration of circadian rhythm (circarian), and consideration of glare of appliances or sunlight are considered, and color rendering properties are not essential but additive items. In this way, in illumination for illuminating an indoor space in which a person works, it is not limited to excellent color rendering properties, and it is required to take the influence of the human body into consideration.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2018-129492

Disclosure of Invention

Problems to be solved by the invention

The invention aims to provide an illumination considering the influence on human body.

Means for solving the problems

An illumination lamp disclosed as an embodiment in the present specification controls color matching in a range from a first temperature to a second temperature that is 2000K or more greater than the first temperature of correlated color temperature, and includes: a first light emitting device that emits light of a luminescent color of a first chromaticity coordinate in which x and y in chromaticity coordinates are equal to or less than x and y values at the second temperature on a blackbody radiation locus in a chromaticity diagram of a CIE1931 color system; a second light-emitting device that emits light of a light-emitting color of a second chromaticity coordinate in which a value of x in the chromaticity coordinate is equal to or greater than a value of x at the first temperature on the blackbody radiation locus in a chromaticity diagram of the CIE1931 color system; a third light emitting device that emits light of a luminescent color of a third chromaticity coordinate in which a value of x in chromaticity coordinates is a first value and a value of y is a second value in a chromaticity diagram of a CIE1931 color system, wherein, in a case where a straight line passing through the first temperature and the second temperature on a black body radiation locus is represented by a function of x and y, the second value is larger than a value of y when the first value is substituted into the value of x of the function; light in a range from the first temperature to the second temperature on a blackbody radiation locus is included in a chromaticity diagram of a CIE1931 color system within an area of a triangle surrounded by a straight line connecting the first chromaticity coordinate and the second chromaticity coordinate, a straight line connecting the second chromaticity coordinate and the third chromaticity coordinate, and a straight line connecting the third chromaticity coordinate and the first chromaticity coordinate, using at least the first light-emitting device, the second light-emitting device, and the third light-emitting device in control of color modulation from the first temperature to the second temperature, when light of correlated color temperature 5000K is emitted on the black body radiation locus, the value of black visual element ratio is more than 1.0, when light is toned in the range of correlated color temperature 3000K to 5000K on the black body radiation locus, the change amount of the black pixel ratio is 0.4 or more.

Further, a dimming control system disclosed as an embodiment in the present specification includes: one or more lighting fixtures and an information processing device communicably connected to a dimming driver of the lighting fixtures and adjusting illumination light of the lighting fixtures in a range from a first temperature to a second temperature of correlated color temperature, wherein the information processing device includes: a dimming determination unit that determines a control command to the dimming driver in order to control the dimming driver to adjust the illumination light of the lighting fixture; a transmission section that transmits the control command determined by the dimming determination section to the dimming driver; the control range of the toning performed by the information processing device is included in a region surrounded by a straight line connecting the first temperature and the second temperature on the blackbody radiation locus and a set of points obtained with respect to all points on the straight line between the first temperature and the second temperature and located at a distance 2 times a distance from a point on the straight line to a point on the blackbody radiation locus at the same correlated color temperature as the point on the straight line in a chromaticity diagram of the CIE1931 color system, and is included not in an outer frame of the region but inside the outer frame in any correlated color temperature at least between the first temperature and the second temperature.

Effects of the invention

According to the present invention, it is possible to provide illumination in which influence on the human body is taken into consideration as compared with the related art.

Drawings

Fig. 1 is a graph showing curves of a circadian response and a visual acuity response.

Fig. 2 is a perspective view of the lighting fixture of the embodiment as viewed from the light-emitting surface side.

Fig. 3 is a perspective view of the lighting fixture of the embodiment as viewed from the installation surface side.

Fig. 4 is a plan view for explaining a light emitting surface of the illumination lamp according to the embodiment.

Fig. 5 is a schematic configuration diagram of a light-emitting device of the embodiment.

Fig. 6 is an example of the emission spectrum of the first light-emitting device used in the lighting fixture of the embodiment.

Fig. 7 shows an example of the emission spectrum of the second light-emitting device used in the lighting fixture according to the embodiment. The lighting fixture with the power adapter according to the embodiment is a perspective view.

Fig. 8 is an example of the emission spectrum of the third light-emitting device used in the illumination lamp of the embodiment.

Fig. 9 is a diagram showing chromaticity coordinates in chromaticity diagrams of the first to third light-emitting devices constituting an example of the illumination lamp of the embodiment.

Fig. 10 is a diagram showing chromaticity coordinates in chromaticity diagrams of the first to third light-emitting devices constituting an example of the illumination lamp of the embodiment.

Fig. 11 is a diagram showing chromaticity coordinates in chromaticity diagrams of the first to third light-emitting devices constituting an example of the illumination lamp of the embodiment.

Fig. 12 is a diagram showing chromaticity coordinates in chromaticity diagrams of the first to third light-emitting devices constituting an example of the illumination lamp of the embodiment.

Fig. 13 is a diagram showing chromaticity coordinates in chromaticity diagrams of the first to third light-emitting devices constituting an example of the illumination lamp of the embodiment.

Fig. 14 is a diagram comparing examples of the illumination lamp according to the embodiment with respect to the black pixel ratio.

Fig. 15 is a configuration diagram showing an example of the dimming control system according to the embodiment.

Fig. 16A is a schematic configuration diagram showing an example of another embodiment of the light-emitting device of the embodiment.

Fig. 16B is a schematic configuration diagram showing an example of another embodiment of the light-emitting device of the embodiment.

Fig. 16C is a schematic configuration diagram showing an example of another embodiment of the light-emitting device of the embodiment.

Detailed Description

First, the influence of illumination on the human body is explained.

When the WELL certification described in the background art is taken as an example, a lighting design in consideration of circadian rhythm (circarian) is required. The term "considering the circadian rhythm" means that a circadian rhythm (circadian rhythm) is considered.

The human circadian rhythm is longer than 1 day and about 25 hours, and if it is not set to 1 day, that is, not matched with the 24-hour period, it becomes a rhythm period deviated from 1 day. Therefore, light plays an important role as a tuning factor for matching with 24 hours. By bathing the sun's light, the human body's internal clock is adjusted to 24 hours, and thus, the human lives in a rhythm of 1 day of sleep early and late.

That is, the human body has a tuning function using light to live at a rhythm of 24 hours. In particular, in the hypothalamus of the brain there is a very small region of the suprachiasmatic nucleus, which plays the role of the in vivo clock of the global circadian rhythm. Further, as cells to which nuclear light signals are given at the suprachiasmatic junction, there are intrinsic photosensitive Retinal Ganglion cells (hereinafter referred to as iprgcs) on the retina.

iprgcs contain melanopsin (melanopsin), a light-receiving protein that defines the involvement of melanopsin in the photomodulation of the circadian rhythm. Melanotropin has an absorption characteristic corresponding to the wavelength of light, and its peak value is in the vicinity of 480 to 490 nm.

Furthermore, melanotropin is considered to be involved in the secretion or inhibition of melatonin as a sleep-promoting hormone, for example, by increasing the amount of stimulation to ipRGC to inhibit the secretion of melatonin. In general, a peak of melatonin secretion in the body occurs at night, and melatonin secretion promotes sleep. Thus, melatonin secretion is suppressed during the day.

In the above-mentioned WELL authentication, an Equivalent blackout pixel illuminance (hereinafter, referred to as EML) is introduced in order to evaluate whether or not the illumination design is one that takes into account the circadian rhythm. The EML is obtained by the following formula (1).

EML illuminance × muranoptic Ratio (1)

The melanopic Ratio (blackpoint Ratio: hereinafter referred to as MR) in the formula (1) is obtained by the following formula (2).

Here, Light represents the spectral distribution of Light by the lighting fixture, Circadian represents the Circadian response based on the spectral sensitivity characteristic of the melanopsin having a peak around 480nm to 490nm, and Visual represents the Visual sensitivity response. Fig. 1 is a graph showing a circadian response and a visual acuity response.

As can be seen from equation (1), 2 types of increasing the illuminance and increasing the MR are considered as increasing the directivity of the EML value. In addition, it can be seen that the MR contrast is large with respect to the dependency of the characteristics of circadian rhythm. Therefore, in consideration of the circadian rhythm, it is considered that the value of the MR is preferably considered. In addition, based on the circadian response, the emission intensity in the range of wavelengths of about 470nm to 490nm is considered as a wavelength band that particularly contributes to the secretion control of melatonin.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. However, the embodiments described below are intended to embody the technical idea of the present invention, and do not limit the present invention. In the following description, the same names and symbols denote the same or similar members, and detailed description thereof will be omitted as appropriate. The sizes, positional relationships, and the like of the components shown in the drawings may be exaggerated for clarity. The relationship between color names and chromaticity coordinates, the relationship between the wavelength range of light and the color name of monochromatic light, and the like comply with JIS Z8110.

< embodiment >

The lighting fixture of the embodiment will be explained. Fig. 2 is a perspective view of the lighting fixture 1 viewed from the light-emitting surface side. Fig. 3 is a perspective view of the lighting fixture 1 as viewed from the installation surface side (the side opposite to the light-emitting surface side). Fig. 4 is a view showing a light emitting surface of the lighting fixture 1. In fig. 4, a part of the cover 40 of the lighting fixture 1 is removed, and the inner structure is shown. Fig. 5 is a schematic cross-sectional view showing the light-emitting device 10 included in the lighting fixture 1.

The lighting fixture 1 includes at least 3 light-emitting devices 10 having different chromaticity coordinates in a chromaticity diagram of the CIE1931 color system (hereinafter, simply referred to as a chromaticity diagram). Here, the 3 light-emitting devices 10 are referred to as a first light-emitting device 101, a second light-emitting device 102, and a third light-emitting device 103, respectively.

By using the 3 light emitting devices 10 included in the lighting fixture 1, color mixing of illumination light can be performed in a predetermined color temperature range. Here, the range of the color temperature controlled using the lighting fixture 1 is described as a first temperature to a second temperature. This range of color temperatures needs to be within the maximum range of color temperatures that are dimmable for the lighting fixture 1, but need not be. However, the illumination light of the illumination lamp 1 is controlled to have a color temperature in a range of 2000K or more.

For example, consider a case where the first temperature is 2700K and the second temperature is 6500K (color matching is performed in a range of color temperatures of 3800K). For example, a case where the first temperature is 3000K and the second temperature is 5000K (color mixing is performed in a range of color temperature of 2000K) is considered.

In the lighting fixture 1, by combining 3 light-emitting devices 10 having different chromaticity coordinates with appropriate characteristics, illumination light along the blackbody radiation locus can be irradiated while the circadian rhythm is taken into consideration when controlling the color mixing.

In the chromaticity diagram, chromaticity coordinates of light emitted from the first light-emitting device 101 are set as first chromaticity coordinates, chromaticity coordinates of light emitted from the second light-emitting device 102 are set as second chromaticity coordinates, and chromaticity coordinates of light emitted from the third light-emitting device are set as third chromaticity coordinates.

Since the illumination light is controlled from the first temperature to the second temperature along the blackbody radiation locus, in the lighting fixture 1, at least the light in the range from the first temperature to the second temperature is included in the area of the triangle connecting the 3 points of the first chromaticity coordinate, the second chromaticity coordinate, and the third chromaticity coordinate, and the light on the blackbody radiation locus, which is the color deviation duv from the blackbody radiation locus measured according to JIS Z8725, is 0.00.

In addition, the 3 light emitting devices 10 satisfy the following conditions.

In the chromaticity diagram of the first light-emitting device 101, the values of x and y in the first chromaticity coordinate are equal to or less than the values of x and y at the second temperature on the blackbody radiation locus. Preferably, the value of x in the first chromaticity coordinate is smaller than the value of x at the second temperature on the blackbody radiation locus by 0.1 or more. In the chromaticity diagram, the value of x in the first chromaticity coordinate is 0.1 to 0.2. In the chromaticity diagram, the value of y in the first chromaticity coordinate is 0.2 to 0.3. In addition, the first light-emitting device 101 is a light-emitting device having a high MR value.

In the chromaticity diagram of the second light-emitting device 102, the value of x in the second chromaticity coordinate is equal to or greater than the value of x at the first temperature on the blackbody radiation locus. In the chromaticity diagram, the value of x in the second chromaticity coordinate is 0.45 to 0.6. In addition, in the chromaticity diagram, the value of y in the second chromaticity coordinate is equal to or less than the value of y at the first temperature on the blackbody radiation locus. In the chromaticity diagram, the value of y in the second chromaticity coordinate is 0.3 to 0.5. In addition, the second light-emitting device 102 is a light-emitting device having a low MR value.

The third light emitting device 103 has a third chromaticity coordinate in the + y direction with respect to a straight line passing through the first temperature and the second temperature on the black body radiation locus in the chromaticity diagram. That is, when the value of x of the third chromaticity coordinate is the first value, the value of y of the third chromaticity coordinate is larger than the value of y obtained by substituting the first value into the value of x of the function representing the straight line. Here, a value of y of the third chromaticity coordinate when the value of x of the third chromaticity coordinate is the first value is referred to as a second value. In the third chromaticity coordinate, the value of x is less than or equal to the value of x at the second temperature on the blackbody radiation locus, and the value of y is greater than or equal to the value of y at the second temperature on the blackbody radiation locus.

In addition, in the chromaticity diagram of the CIE1931 color system, the value of x in the third chromaticity coordinate of the third light-emitting device 103 is 0.1 to 0.6. In the chromaticity diagram of the CIE1931 color system, the value of x in the chromaticity coordinate of the third chromaticity coordinate may be 0.4 to 0.5. In the chromaticity diagram of the CIE1931 color system, x in the chromaticity coordinate of the third chromaticity coordinate may be 0.3 to 0.4. In the chromaticity diagram, the value of y in the third chromaticity coordinate is 0.3 to 0.6. The third light-emitting device 103 has a lower MR value than the first light-emitting device 101 and a higher MR value than the second light-emitting device 102.

The high value of MR described for the first light emitting device 101 means that the value of MR has a value close to about 2.00 or a value larger than it. The MR value of the first light-emitting device 101 is preferably 2.00 or more, more preferably 2.50 or more, and further preferably 2.80 or more. The higher the MR value, the more the melatonin secretion is suppressed. The MR value in the first light-emitting device 101 is 3.00 or less. However, the upper limit value may exceed 3.00.

A low value of MR as described for the second light emitting means 102 means that the value of MR has a value close to about 0.40, or a value smaller than this. Preferably 0.40 or less, more preferably 0.30 or less, and still more preferably 0.25 or less. The lower the MR value, the more the melatonin secretion is promoted. The MR value in the second light-emitting device 102 is 0.0 or more.

The third light-emitting device 103 may be a light-emitting device in which the MR value is 1.0 or more when the value of x in the third chromaticity coordinate is smaller than the middle between the value of x in the first chromaticity coordinate and the value of x in the second chromaticity coordinate by 0.1 or more in the chromaticity diagram. On the other hand, when the MR value is larger than the middle by 0.1 or more, a light-emitting device having a high MR value of 0.5 or less can be used. When the MR value is less than ± 0.1 from the middle, a light-emitting device having an MR value of 0.5 or more and 1.0 or less can be used. The MR value of the third light-emitting device 103 is preferably 2.00 or more.

In the lighting fixture 1, a plurality of 3 light-emitting devices 10 are arranged, or a plurality of 4 or more light-emitting devices 10, to which other light-emitting devices are added, are arranged to emit illumination light as a whole.

The lighting fixture 1 includes a base plate 20, a substrate 30, a light-emitting device 10, a cover 40, and a mounting portion 50. The lighting fixture 1 is connected to a dimming driver that adjusts illumination light of the lighting fixture 1. The lighting fixture 1 may be a lighting fixture in which a dimming driver is incorporated.

The dimming driver is loaded with a driving program for adjusting light emitted by the lighting fixture 1. The program is stored in a memory such as a ROM or a RAM of the dimming driver, and is developed by a processor such as a CPU to execute the processing.

In the lighting fixture 1, the base plate 30 is mounted on the base plate 20. Further, a plurality of light emitting devices 10 are mounted on the substrate 30. The plurality of light emitting devices 10 are electrically connected by wiring, and are supplied with power from an external power supply to control light emission of the light emitting devices 10.

The cover 40 is attached to the base plate 20 so as to surround the plurality of light-emitting devices 10 arranged on the substrate 30. The mounting portion 50 is provided on a surface (mounting surface) of the base plate 20 opposite to the surface on which the light-emitting device 10 is disposed. The lighting fixture 1 is attached to the support body by the attachment portion 50. The support body is, for example, a ceiling, a wall, or a rack. In the example of the figure, a mounting portion 50 is shown which is supposed to be provided on a ceiling.

In the lighting fixture 1, the first light-emitting device 101, the second light-emitting device 102, and the third light-emitting device 103 are arranged in this order as the light-emitting devices 10. In the example of fig. 4, the plurality of light emitting devices 10 are arranged in a matrix, and the first light emitting device 101, the second light emitting device 102, and the third light emitting device 103 are sequentially arranged in 1 column (or 1 row). The pixels may be alternately arranged in units other than row or column units. For example, the light-emitting devices may be alternately arranged in units of one light-emitting device or in units of a plurality of light-emitting devices. Each of the first light-emitting device 101, the second light-emitting device 102, and the third light-emitting device 103 includes a light-emitting element and a phosphor.

The light-emitting device 10 includes a molded body 11, a light-emitting element 12, and a wavelength conversion member 13. The light-emitting element 12 can be a nitride semiconductor having an emission peak in a range of 410nm to 490 nm. The wavelength conversion member 13 can use a fluorescent material 14 that is excited by light from the light emitting element 12 and emits light of a different wavelength. The molded body 11 is a housing that houses the light-emitting element 12 and the wavelength conversion member 13.

The first light emitting device 101 and the second light emitting device 102 contain phosphors having different compositions from each other as main phosphors. The primary phosphor is the phosphor that is contained most in the wavelength conversion member 13 of the light-emitting device 10. By using a light-emitting device having a different primary phosphor, the difference between the MR value at a high color temperature and the MR value at a low color temperature can be increased as compared with a light-emitting device using the same primary phosphor.

The light-emitting element 12 is not limited to a nitride semiconductor. Further, a light-emitting element having an emission peak outside the above range may be used. As the light emitting element, an organic EL, a laser diode, or the like can be used in addition to the LED. The molded body 11 may not be provided.

Specific examples of light-emitting devices used as the first light-emitting device 101, the second light-emitting device 102, and the third light-emitting device 103 are given below. Fig. 6 shows an emission spectrum in each example of the first light-emitting device 101, fig. 7 shows an emission spectrum in each example of the second light-emitting device 102, and fig. 8 shows an emission spectrum in each example of the third light-emitting device 103.

< first light emitting device 101 example 1 >

For example, the first light-emitting device 101 can be a light-emitting device including a light-emitting element 12 and a wavelength conversion member 13, the light-emitting element 12 being a nitride semiconductor having an emission peak in a range of 410nm to 470nm inclusive, and more preferably, in a range of 420nm to 460nm inclusive, and the wavelength conversion member 13 containing a compound represented by the formula Sr₄Al₁₄O₂₅: an alkaline earth metal aluminate phosphor having a composition expressed by Eu has an emission peak at 495nm as a main phosphor. In the first light-emitting device 101, in the chromaticity diagram, the value of x is 0.149 and the value of y is 0.223 in the first chromaticity coordinate. The MR value was 2.85. The light emission efficiency was 122 lm/W.

< first light emitting device 101 example 2 >

For example, the first light-emitting device 101 can be a light-emitting device including a light-emitting element 12 and a wavelength conversion member 13, the light-emitting element 12 being a nitride semiconductor having an emission peak in a range of 410nm to 490nm, the wavelength conversion member 13 containing a compound represented by formula Ca₈Mg(SiO₄)₄Cl₂: the chlorosilicate phosphor having a composition expressed by Eu has an emission peak at 510nm as a main phosphor. In the first light-emitting device 101, in the chromaticity diagram, the value of x of the first chromaticity coordinate is 0.167, and the value of y is 0.246. The MR value was 2.07. The luminous efficiency was 145 lm/W.

< first light emitting device 101 example 3 >

For example, the first light-emitting device 101 can be a light-emitting device including a light-emitting element 12 and a wavelength conversion member 13, the light-emitting element 12 being a nitride semiconductor having an emission peak in a range of 410nm to 470nm, and the wavelength conversion member 13 containing a light-emitting material composed of Lu₃(Al,Ga)₅O₁₂: the rare earth aluminate phosphor having a composition represented by Ce has an emission peak at 496nm as a main phosphor. In the first light-emitting device 101, in the chromaticity diagram, the value of x of the first chromaticity coordinate is 0.191, and the value of y is 0.265. The MR value was 1.94. Further, the luminous efficiency was 148 lm/W.

< example 1 of second light-emitting device 102 >

For example, the second light-emitting device 102 can be a light-emitting device including a light-emitting element 12 and a wavelength conversion member 13, the light-emitting element 12 being a nitride semiconductor having an emission peak in a range of 410nm to 490nm, the wavelength conversion member 13 containing a compound represented by formula Y₃Al₅O₁₂: rare earth aluminate phosphor having composition represented by Ce and having formula Lu₃Al₅O₁₂: rare earth aluminate phosphor having composition represented by Ce and having formula (Sr, Ca) AlSiN₃: a silicon nitride phosphor having a composition expressed by Eu as a main phosphor. In the second light-emitting device 102, in the chromaticity diagram, the value of x of the second chromaticity coordinate is 0.539, the value of y is 0.443, the correlated color temperature is 2000K, and the color deviation duv is + 0.01. The MR value was 0.23. The light emission efficiency was 168 lm/W.

< second light-emitting device 102 example 2 >

For example, the second light-emitting device 102 may be a light-emitting device including a light-emitting element 12 and a wavelength conversion member 13, the light-emitting element 12 being a nitride semiconductor having an emission peak in a range of 410nm to 490nm, the wavelength conversion member 13 containing a compound represented by formula Y₃Al₅O₁₂: rare earth aluminate phosphor having composition represented by Ce and having formula Lu₃Al₅O₁₂: rare earth aluminate fluorescence of composition represented by CeA body and a crystalline material having the formula (Sr, Ca) AlSiN₃: a silicon nitride phosphor having a composition represented by Eu as a main phosphor. In this second light emitting device 102, the value of x of the second chromaticity coordinate is 0.505, the value of y is 0.359, the correlated color temperature is 2000K, and the color deviation duv is-0.02 in the chromaticity diagram. The MR value was 0.35. The light emission efficiency was 144 lm/W.

< second light-emitting device 102 example 3 >

For example, the second light-emitting device 102 may be a light-emitting device including a light-emitting element 12 and a wavelength conversion member 13, the light-emitting element 12 being a nitride semiconductor having an emission peak in a range of 410nm to 490nm, the wavelength conversion member 13 containing a compound represented by formula Y₃Al₅O₁₂: rare earth aluminate phosphor having composition represented by Ce and having formula Lu₃Al₅O₁₂: rare earth aluminate phosphor having composition represented by Ce and having formula (Sr, Ca) AlSiN₃: a silicon nitride phosphor having a composition represented by Eu as a main phosphor. In the second light-emitting device 102, in the chromaticity diagram, the value of x of the second chromaticity coordinate is 0.524, the value of y is 0.416, the correlated color temperature is 2000K, and the color deviation duv is 0.00. The MR value was 0.28. The luminous efficiency was 131 lm/W.

< third light-emitting device 103 example 1 >

For example, the third light-emitting device 103 can be a light-emitting device including a light-emitting element 12 and a wavelength conversion member 13, the light-emitting element 12 being a nitride semiconductor having an emission peak in a range of 410nm to 470nm inclusive, and more preferably in a range of 420nm to 460nm inclusive, the wavelength conversion member 13 containing a compound represented by the formula Sr₄Al₁₄O₂₅: an alkaline earth metal aluminate phosphor having a composition represented by Eu has an emission peak at 495nm as a main phosphor. In the third light-emitting device 103, in the chromaticity diagram, the value of x of the third chromaticity coordinate is 0.145, and the value of y is 0.354. The MR value was 2.32. The light emission efficiency was 151 lm/W.

< third light-emitting device 103 example 2 >

In addition, for example, the third light emissionThe device 103 can use a light-emitting device having a light-emitting element 12 and a wavelength conversion member 13, the light-emitting element 12 being a nitride semiconductor having an emission peak in a range of 410nm to 490nm, the wavelength conversion member 13 containing a compound represented by the formula Y₃Al₅O₁₂: rare earth aluminate phosphor having composition represented by Ce and having formula Lu₃Al₅O₁₂: rare earth aluminate phosphor having composition represented by Ce and having formula (Sr, Ca) AlSiN₃: a silicon nitride phosphor having a composition represented by Eu as a main phosphor. In the third light emitting device 103, in the chromaticity diagram, the value of x of the third chromaticity coordinate is 0.467, the value of y is 0.471, the correlated color temperature is 3000K, and the color deviation duv is + 0.02. The MR value was 0.38. The light emission efficiency was 204 lm/W.

< third light-emitting device 103 example 3 >

For example, the third light-emitting device 103 may be a light-emitting device including a light-emitting element 12 and a wavelength conversion member 13, the light-emitting element 12 being a nitride semiconductor having an emission peak in a range of 410nm to 490nm, the wavelength conversion member 13 containing a compound represented by formula Y₃(Al,Ga)₅O₁₂: the rare earth aluminate phosphor having a composition represented by Ce has an emission peak at 496nm as a main phosphor. In the third light-emitting device 103, in the chromaticity diagram, the value of x of the third chromaticity coordinate is 0.331, and the value of y is 0.548. The MR value was 0.76. The light emission efficiency was 242 lm/W.

Next, an example of the lighting fixture 1 configured to include the first light-emitting device 101, the second light-emitting device 102, and the third light-emitting device 103 as illustrated above is given. The following lighting fixture (hereinafter referred to as a comparative lighting fixture) is employed as a comparison target of the lighting fixture 1. In the prior art, a comparative illumination lamp was selected from the viewpoints of the excellent luminous efficiency and the high color rendering required for illumination.

< comparison lighting fixture >

The comparison lighting lamp is composed of two light-emitting devices with correlated color temperatures of 2700K and 6500K respectively and color deviation of 0.00. In addition, the first and second substrates are,any light-emitting device is also a light-emitting device comprising a light-emitting element 12 and a wavelength conversion member 13, wherein the light-emitting element 12 is a nitride semiconductor having an emission peak in a range of 410nm to 490nm, and the wavelength conversion member 13 contains a compound represented by the formula Y₃Al₅O₁₂: rare earth aluminate phosphor having composition represented by Ce and having formula Lu₃Al₅O₁₂: rare earth aluminate phosphor having composition represented by Ce and having formula (Sr, Ca) AlSiN₃: eu, and a silicon nitride phosphor having a composition represented by the formula. The average color rendering evaluation value (Ra) is more than 80, and the luminous efficiency is 180 lm/W-200 m/W in the range of 2700K-6500K of correlated color temperature. Details are shown in table a below.

[ Table A ]

< example 1 of Lighting device

The lighting fixture 1 of example 1 is constituted by the first light-emitting device 101, the second light-emitting device 102, and the third light-emitting device 103 in each example 1. The results of values corresponding to the items in table a above in the lighting fixture 1 of example 1 are shown in table 1 below. Fig. 9 shows chromaticity charts showing the relationship among the first chromaticity coordinate, the second chromaticity coordinate, the third chromaticity coordinate, the adjustable color range (a triangle connecting 3 points), and the blackbody radiation locus of the lighting fixture 1 of example 1.

[ Table 1]

Thus, in the illumination lamp 1 of example 1, the amount of change in MR in the range of correlated color temperatures 2700K to 6500K is 0.75, which is larger than that of the comparative illumination lamp. In addition, in the range of 3000K to 5000K, the MR variation amount is 0.45, which is larger than that of the comparative illumination lamp. In addition, the value of MR at the same color temperature is higher than that of the comparative lighting fixture. Here, the same target color temperatures are compared with each other, and the difference exists in the actual result color temperature, but the difference is allowable and is referred to as the same color temperature. When light of a correlated color temperature of 5000K is emitted on the black body radiation locus (color deviation duv of 0.000), the MR value of the illumination lamp 1 of example 1 is 1.0 or more, and when light is color-adjusted in a range of 3000K to 5000K of the correlated color temperature on the black body radiation locus, the amount of change in MR of the illumination lamp 1 of example 1 is 0.4 or more.

Although the light emission efficiency is slightly inferior to that of the comparative illumination lamp, the average 160[ lm/W ] is achieved in any of the ranges of 2700K to 6500K and 3000K to 5000K, but the average 170[ lm/W ] is not achieved in any of the toning ranges. Color rendering was the same as the comparative lighting fixture, with Ra achieving an average of 80 in this color range, but not an average of 85.

< example 2 of Lighting device 1 >

The lighting fixture 1 of example 2 is configured by the first light-emitting device 101 in example 1 and the second light-emitting device 102 and the third light-emitting device 103 in each example 2. The results of the values corresponding to the items in table a are shown in table 2 below for the lighting fixture 1 of example 2. Fig. 10 shows chromaticity charts showing the relationship among the first chromaticity coordinate, the second chromaticity coordinate, the third chromaticity coordinate, the adjustable color range (a triangle connecting 3 points), and the blackbody radiation locus of the lighting fixture 1 of example 2.

[ Table 2]

As described above, in the illumination lamp 1 of example 2, the amount of change in MR in the range of correlated color temperatures 2700K to 6500K is larger than that in the comparative illumination lamp. In addition, in the range of 3000K to 5000K, the MR variation amount is larger than that of the comparative illumination lamp. In addition, the value of MR at the same color temperature is higher than that of the comparative lighting fixture. When light of a correlated color temperature of 5000K is emitted on the black body radiation locus (color deviation duv of 0.000), the MR value of the illumination lamp 1 of example 2 is 1.0 or more, and when light is color-adjusted in a range of 3000K to 5000K of the correlated color temperature on the black body radiation locus, the change amount of the MR value of the illumination lamp 1 of example 2 is 0.4 or more.

In particular, the illumination lamp 1 of example 2 has a small difference in MR value from the comparative illumination lamp at a low color temperature (first color temperature), while the difference increases when the color temperature is high (second color temperature). It can be said that the lighting fixture 1 of example 2 is effective for a life rhythm with active daytime and calm afternoon.

Further, the light emitting efficiency is inferior to that of the comparative light fixture, but the light fixture 1 of the ratio 1 is excellent, and even in any range of 2700K to 6500K and 3000K to 5000K, an average 170[ lm/W ] is achieved in the color modulation range, but an average 180[ lm/W ] is not achieved. Further, the color rendering ratio was superior to that of the illumination lamp 1 of the illumination lamp and example 1, and Ra achieved an average of 85 or more but not an average of 90 in this color modulation range. When light is dimmed in a range of correlated color temperatures from 3000K to 5000K on a black body radiation locus (duv of 0.000), the average color rendering evaluation number of the lighting fixture 1 of example 2 reaches 85, and the luminous efficiency [ lm/W ] of the lighting fixture 1 of example 2 reaches 170.

< 1 example 3 of illumination lamps

The lighting fixture 1 of example 3 is configured by the first light-emitting device 101 in example 1 and the second light-emitting device 102 and the third light-emitting device 103 in each example 3. The results of the values corresponding to the items in table a are shown in table 3 below for the lighting fixture 1 of example 3. Fig. 11 shows chromaticity charts showing the relationship among the first chromaticity coordinate, the second chromaticity coordinate, the third chromaticity coordinate, the adjustable color range (a triangle connecting 3 points), and the blackbody radiation locus of the lighting fixture 1 of example 3.

[ Table 3]

As described above, in the illumination lamp 1 of example 3, the amount of change in MR in the range of correlated color temperatures 2700K to 6500K is larger than that in the comparative illumination lamp. In addition, in the range of 3000K to 5000K, the MR variation amount is larger than that of the comparative illumination lamp. In addition, the value of MR at the same color temperature is higher than that of the comparative lighting fixture. When light of a correlated color temperature of 5000K is emitted on the black body radiation locus (color deviation duv of 0.000), the MR value of the illumination lamp 1 of example 3 is 1.0 or more, and when light is color-adjusted in a range of 3000K to 5000K of the correlated color temperature on the black body radiation locus, the change amount of the MR value of the illumination lamp 1 of example 3 is 0.4 or more.

The luminous efficiency is inferior to that of the comparative illumination lamp, and even in any range of 2700K to 6500K and 3000K to 5000K, an average of 140[ lm/W ] is achieved in the color mixing range, but an average of 150[ lm/W ] is not achieved. On the other hand, the color rendering properties are excellent, and in particular, Ra is 90 in the low color temperature range of 4000K or less. The difference in color rendering properties at the first color temperature and the second color temperature is larger than that of the other illumination appliance 1.

< 1 example 4 of illumination device

The lighting fixture 1 of example 4 is constituted by the first light-emitting device 101, the second light-emitting device 102, and the third light-emitting device 103 in each example 2. The results of the values corresponding to the items in table a are shown in table 4 below for the lighting fixture 1 of example 4. Fig. 12 shows a chromaticity diagram showing the relationship between the first chromaticity coordinate, the second chromaticity coordinate, the third chromaticity coordinate, the adjustable color range (a triangle connecting 3 points), and the blackbody radiation locus of the lighting fixture 1 of example 4.

[ Table 4]

Thus, in the illumination lamp 1 of example 4, the amount of change in MR in the range of correlated color temperatures 2700K to 6500K is larger than that in the comparative illumination lamp. In addition, in the range of 3000K to 5000K, the MR variation amount is larger than that of the comparative illumination lamp. In addition, the value of MR at the same color temperature is higher than that of the comparative lighting fixture. When light of a correlated color temperature of 5000K is emitted on the black body radiation locus (color deviation duv is 0.000), the MR value of the illumination lamp 1 of example 4 is less than 1.0, and when light is color-adjusted in a range of 3000K to 5000K of the correlated color temperature on the black body radiation locus, the amount of change in MR of the illumination lamp 1 of example 4 is 0.4 or more.

The lighting fixture 1 of example 4 has similar characteristics to the lighting fixture 1 of example 2. Similarly to the illumination lamp 1 of example 2, the illumination lamp 1 of example 4 has a low color temperature (first color temperature) and a large difference in MR value from the comparative illumination lamp, while having a high color temperature (second color temperature). However, the increase ratio 2 of the difference at high color temperatures is small in the lighting fixture 1. On the other hand, the lighting fixture 1 having the color rendering ratio 2 at a high color temperature of 4000K or more is excellent.

< example 5 of Lighting device 1 >

The lighting fixture 1 of example 5 is configured by the first light-emitting device 101 in example 3 and the second light-emitting device 102 and the third light-emitting device 103 in each example 2. The results of the values corresponding to the items in table a above for the lighting fixture 1 of example 5 are shown in table 5 below. Fig. 13 shows chromaticity charts showing the relationship among the first chromaticity coordinate, the second chromaticity coordinate, the third chromaticity coordinate, the adjustable color range (a triangle connecting 3 points), and the blackbody radiation locus of the lighting fixture 1 of example 5.

[ Table 5]

Thus, in the illumination lamp 1 of example 5, the amount of change in MR in the range of correlated color temperatures 2700K to 6500K is larger than that in the comparative illumination lamp. In addition, in the range of 3000K to 5000K, the MR variation amount is larger than that of the comparative illumination lamp. In addition, the value of MR at the same color temperature is higher than that of the comparative lighting fixture. The lighting fixture 1 of example 5 has substantially the same characteristics as the lighting fixture 1 of example 4. When light of a correlated color temperature of 5000K is emitted on the black body radiation locus (color deviation duv is 0.000), the value of the blackout ratio of the illumination appliance 1 of example 5 is less than 1.0, and when light is toned on the black body radiation locus in a range of 3000K to 5000K of the correlated color temperature, the variation amount of the value of the blackout ratio of the illumination appliance 1 of example 5 is 0.4 or more.

As described above, according to the illumination lamp 1 as an example, it is possible to provide illumination in which the color can be changed while changing the MR value, and the influence on the human body can be taken into consideration, as compared with the conventional art.

The lighting fixtures 1 of examples 1 to 5 can perform color matching on the black body radiation locus, and when light is color-matched in the range of correlated color temperature 3000K to 5000K, the change amount of the blackout ratio reaches at least 0.35. In addition, in the more preferable illumination appliance 1, the change amount of the value of the blackout pixel ratio reaches at least 0.40. In a more preferable lighting fixture 1, the amount of change in the value of the blackout pixel ratio is at least 0.45.

When light is toned in the range of the correlated color temperature 2700K to 6500K, the change amount of the black pixel ratio is at least 0.6. In addition, in the more preferable illumination appliance 1, the change amount of the value of the blackout pixel ratio reaches at least 0.70. In a more preferable lighting fixture 1, the amount of change in the value of the blackout pixel ratio reaches at least 0.75.

In the preferred illumination lamp 1, the blackout ratio at a correlated color temperature of 3000K is 0.5 or less, and the blackout ratio at a correlated color temperature of 5000K is 1.0 or more. In the lighting fixture 1 of example 1, which realizes the maximum value of the blackout ratio, the value of the blackout ratio at the correlated color temperature of 6500K reached 1.3. That is, when the correlated color temperature of 6500K is emitted on the blackbody radiation locus, the value of the blackout ratio of the illumination appliance 1 of example 1 reaches 1.3.

In fact, when used as a lighting fixture, not only a simple blackout pixel ratio value but also a relation with light emission efficiency is important. In the case of low luminous efficiency, the light beam [ lm ] can be compensated by correspondingly increasing the access power [ W ]. However, if control is performed to change the access power according to the color temperature in the color adjustment range, the device becomes complicated. On the basis of this, the user can be given a high satisfaction degree without sacrificing energy saving factors as much as possible.

Fig. 14 is a graph comparing the comparison of the illumination lamp and each of the illumination lamps 1 of examples 1 to 5 with a value obtained by multiplying the MR value and the luminous efficiency. This value represents the relative relationship of the blackout ratio in illumination illuminated with power of 1.0[ W ]. Hereinafter, the relative melanopsin ratio is referred to. For easy comparison, the drawings are based on a comparison lighting fixture.

As shown in fig. 14, it is clearly seen that the lighting fixture 1 of example 1 and the lighting fixture 1 of example 2 have a larger relative blackout pixel ratio than the comparative lighting fixture. The lighting fixture 1 of example 1 is preferable to be relatively blackout at a low color temperature, and decreases in color temperature as the color temperature increases. The lighting fixture 1 of example 2 is preferable to the blackout element in the high color temperature, and increases as the color temperature becomes high.

When the relative blackout ratio is larger in a high color temperature than in a low color temperature, it can be said that a lighting fixture that provides lighting in which a circadian rhythm is more taken into consideration while taking energy efficiency into consideration is provided. It can be said that the lighting fixture 1 of example 2 has excellent performance as lighting in consideration of circadian rhythm.

Next, the color tuning control performed by the lighting fixture 1 will be described.

The lighting fixture 1 is capable of being color-tuned using at least 3 light emitting devices 10, and further includes a first temperature to a second temperature on a blackbody radiation locus in the color tuning range. Therefore, compared to the color matching by the two light emitting devices as in the comparative lighting fixture, the color matching along the blackbody radiation locus can be performed with high accuracy.

A dimming control system having a plurality of lighting fixtures 1 and an information processing device 2 communicably connected to a dimming driver of each lighting fixture 1 and controlling the dimming driver to adjust illumination light of each lighting fixture 1 is constructed to realize such control under color-toning of correlated color temperature from a first temperature to a second temperature. Fig. 15 is a configuration diagram showing an example of the configuration of the dimming control system. The number of the lighting fixtures 1 may be 1.

The information processing device 2 is a computer, a server device, or the like, and is a device capable of performing transmission and reception of information through communication, and arithmetic processing based on received information or recorded information. The information processing apparatus is equipped with a processor such as a CPU that controls arithmetic processing, a storage unit such as an HDD that stores programs and information, and a memory such as a ROM or RAM that expands the programs and provides a storage area for executing the processing.

In the dimming control system, the information processing device 2 includes a dimming determination unit 3 that determines a control command to the dimming driver in order to adjust the illumination light of the illumination appliance 1. The dimming determination section 3 determines the light emission ratio of the light emitting device 10 in the chromaticity diagram so as to irradiate the illumination light in the chromaticity coordinate closer to the blackbody radiation locus than the straight line connecting the first temperature and the second temperature on the blackbody radiation locus when the color tuning is controlled in the range from the first temperature to the second temperature of the correlated color temperature.

The information processing apparatus 2 further includes a transmission unit 4 that transmits a control command to the dimming driver. The transmission unit 4 transmits a control command to the dimming driver so that the light emitting device 10 emits light at the determined light emission ratio. Thus, the dimming driver can perform dimming based on the control command, and can perform color adjustment along the blackbody radiation locus with high precision.

At this time, the control range of the toning performed by the information processing device 2 is included in the chromaticity diagram in an area surrounded by a set of a straight line connecting the first temperature and the second temperature on the blackbody radiation locus and a point that is located at a distance equal to 2 times the distance from a point on the straight line to a point on the blackbody radiation locus at the same correlated color temperature as the point, the distance being obtained with respect to all points on the straight line between the first temperature and the second temperature. At least in any color temperature between the first temperature and the second temperature, the color temperature is not included in the outer frame of the region but is included inside the outer frame. In the chromaticity diagram of the CIE1931 color system, the control range of the color toning performed by the information processing device 2 is preferably within ± 0.001 of the color deviation duv of the blackbody radiation locus between the first temperature and the second temperature.

In order to perform color matching with the circadian rhythm, it is preferable to perform color matching in accordance with a change in the color temperature of sunlight. However, it may not exactly match the change of sunlight. For example, consider the following toning: the MR value becomes the lowest value in one day and the maximum value at 0 to 6 points in one day. Then, the maximum value is maintained until 15: 30, the MR value is decreased with time between 15: 30 and 19, and the value becomes the minimum value after 19.

That is, the information processing device 2 controls the MR value to be the maximum at a predetermined time of the morning. Further, the control is performed such that the MR value is decreased after a predetermined time has elapsed from a predetermined time in the afternoon. The MR value may be increased after a predetermined time from a predetermined morning.

The MR is maximized when the color temperature is maximized within the color tuning range. On the other hand, the MR minimization is to minimize the color temperature in the color-toning range.

The embodiments of the present invention have been described above, but the technical idea of the present invention is not limited to the specific embodiments described above. For example, in the embodiment, it is not necessary to limit the installation place of the dimming control system of the present invention to an office building.

The first light-emitting device 101, the second light-emitting device 102, and the third light-emitting device 103 may be mounted on the substrate 30 as physically separate light-emitting devices 10, or may be mounted by integrally forming an arbitrary plurality of light-emitting devices.

Fig. 16A to 16C are some examples of the light-emitting device 10 implemented in an embodiment in which a plurality of light-emitting devices 100 are integrally formed. The plurality of light-emitting devices 100 formed integrally include two or more light-emitting devices selected from the first light-emitting device 101, the second light-emitting device 102, and the third light-emitting device 103.

Fig. 16A shows an embodiment of the light-emitting device 10 in which two cavities are formed by one molded body 11, and the light-emitting element 12 and the wavelength conversion member 13 of one light-emitting device 100 out of the plurality of light-emitting devices 100, and the light-emitting element 12 and the wavelength conversion member 13 of the other light-emitting device 100 are disposed in the respective cavities.

Fig. 16B shows an embodiment of the light-emitting device 10 in which one cavity is formed by one molded body 11, and the light-emitting element 12 and the wavelength conversion member 13 of one light-emitting device 100 out of the plurality of light-emitting devices 100, and the light-emitting element 12 and the wavelength conversion member 13 of the other light-emitting device 100 are disposed in the cavity.

The wavelength conversion member 13 for emitting light from one light emitting device 100 (one light emitting device 100 of the two light emitting devices 100 shown), that is, the wavelength conversion member 13 unnecessary for emitting light from the other light emitting device 100 (the other light emitting device 100 of the two light emitting devices 100 shown) is provided only around the light emitting element 12 of the one light emitting device 100. Similarly, the wavelength conversion member 13 for light emission by another light-emitting device 100, that is, the wavelength conversion member 13 unnecessary for light emission by one light-emitting device 100 is provided only around the light-emitting element 12 of the other light-emitting device 100. The wavelength conversion member 13 required for light emission by one light emitting device 100 and the other light emitting devices 100 is also provided so as to cover any light emitting device 100.

Fig. 16C shows an embodiment of the light-emitting device 10 in which one cavity is formed by one molded body 11, and the light-emitting element 12 and the wavelength conversion member 13 of one light-emitting device 100, and the light-emitting element 12 and the wavelength conversion member 13 of another light-emitting device 100 are disposed in the cavity.

In addition, as compared with fig. 16B, there is no wavelength conversion member 13 for light emission by one light-emitting device 100, that is, there is no wavelength conversion member 13 unnecessary for light emission by another light-emitting device 100. On the other hand, the wavelength conversion member 13 for light emission by the other light emitting devices 100, that is, the wavelength conversion member 13 unnecessary for light emission by one light emitting device 100 is provided only around the light emitting elements 12 of the other light emitting devices 100.

The wavelength conversion member 13 provided only around the light-emitting element 12 of the other light-emitting device 100 is formed of a plurality of layers. One layer may be used. In each layer, the phosphor is disposed on the lower surface in an offset manner. For example, such a wavelength conversion member 13 can be formed by attaching a sheet-like fluorescent material to a glass material.

In addition, the side surfaces of the light emitting elements 12 of the other light emitting devices 100 are covered with the reflective layer 15. Thus, light from the light emitting element 12 of one light emitting device 100 is reflected by the reflective layer 15 before being incident on the light emitting element 12 of the other light emitting device 100. Therefore, it is possible to suppress light from the light emitting element 12 of one light emitting device 100 from being wavelength-converted by the wavelength converting member 13 provided only around the light emitting element 12 of the other light emitting device 100.

In this way, according to the light-emitting device 10 in which the plurality of light-emitting devices 100 are integrally formed, it is possible to provide the light-emitting device 10 which includes the first light-emitting device 101, the second light-emitting device 102, and the third light-emitting device 103 and which is handled by one package. By controlling the light emission of the light emitting device 10 as described above, a dimming control system can be realized.

The present invention can be applied to any device that does not necessarily have all of the components disclosed in the embodiments. In the field of the invention or the field of the invention, the present invention can be applied to a part of the claims not describing the components disclosed in the embodiments as long as the degree of freedom of design is within the range, and the present invention is disclosed in the present specification on the premise of including the above.

Industrial applicability

The dimming control system and the lighting fixture according to each embodiment can be used in the field of lighting installed in an indoor space or the like.

Description of the reference numerals

1 Lighting lamp

10 light emitting device

101 first light emitting device

102 second light emitting device

103 third light emitting device

11 shaped body

12 light emitting element

13 wavelength conversion member

14 fluorescent substance

15 reflective layer

20 base plate

30 base plate

40 cover

50 mounting part

2 information processing apparatus

3 light adjustment determination unit

4 transmitting part

Claims

1. A lighting fixture for controlling color modulation in a range from a first temperature to a second temperature which is more than 2000K greater than the first temperature of correlated color temperature, comprising:

a first light emitting device that emits light of a luminescent color of a first chromaticity coordinate in which x and y in chromaticity coordinates are equal to or less than x and y values at the second temperature on a blackbody radiation locus in a chromaticity diagram of a CIE1931 color system;

a second light-emitting device that emits light of a luminescent color of a second chromaticity coordinate in which a value of x in chromaticity coordinates is equal to or greater than a value of x at the first temperature on a blackbody radiation locus in a chromaticity diagram of a CIE1931 color system;

a third light emitting device that emits light of a luminescent color of a third chromaticity coordinate in which a value of x in chromaticity coordinates is a first value and a value of y is a second value in a chromaticity diagram of a CIE1931 color system, wherein, in a case where a straight line passing through the first temperature and the second temperature on a black body radiation locus is represented by a function of x and y, the second value is larger than a value of y when the first value is substituted into the value of x of the function;

light in a range from the first temperature to the second temperature on a blackbody radiation locus is included in a chromaticity diagram of a CIE1931 color system within an area of a triangle surrounded by a straight line connecting the first chromaticity coordinate and the second chromaticity coordinate, a straight line connecting the second chromaticity coordinate and the third chromaticity coordinate, and a straight line connecting the third chromaticity coordinate and the first chromaticity coordinate,

using at least the first light-emitting device, the second light-emitting device, and the third light-emitting device in control of color modulation from the first temperature to the second temperature,

when light of correlated color temperature 5000K is emitted on the black body radiation locus, the value of black visual element ratio is more than 1.0,

when light is toned in the range of correlated color temperature 3000K to 5000K on the black body radiation locus, the change amount of the black pixel ratio is 0.4 or more.

2. The lighting fixture of claim 1,

the value of x of the first chromaticity coordinate is smaller than the value of x at the second temperature on the blackbody radiation locus by more than 0.1.

3. The lighting fixture of claim 1 or 2,

the value of x of the first chromaticity coordinate is 0.1 to 0.2, and the value of y is 0.2 to 0.3.

4. The lighting fixture of any of claims 1-3,

when light of a correlated color temperature of 6500K is emitted on the blackbody radiation locus, the value of the blackout ratio reaches 1.3.

5. The lighting fixture of claim 4,

and the value of x of the third chromaticity coordinate is less than the value of x at the second temperature on the blackbody radiation locus, and the value of y is more than the value of y at the second temperature on the blackbody radiation locus.

6. The lighting fixture of claim 4 or 5,

the first light-emitting device and the third light-emitting device have a blackout pixel ratio of 2.0 or more.

7. The lighting fixture of any of claims 1-3,

the value of y of the second chromaticity coordinate is below the value of y at the first temperature on the blackbody radiation locus,

in a chromaticity diagram of the CIE1931 color system, a value of x in a chromaticity coordinate of the third chromaticity coordinate is 0.4 to 0.5.

8. The lighting fixture of claim 7,

when light is toned in the range of correlated color temperature 3000K-5000K on the black body radiation locus, the average color rendering evaluation number reaches 85, and the luminous efficiency [ lm/W ] reaches 170.

9. The lighting fixture of any of claims 1-3,

in a chromaticity diagram of the CIE1931 color system, a value of x in a chromaticity coordinate of the third chromaticity coordinate is 0.3 to 0.4.

10. The lighting fixture of any of claims 1-9,

the first light-emitting device, the second light-emitting device, and the third light-emitting device each have a light-emitting element and a phosphor.

11. The lighting fixture of any of claims 1-10,

the first light-emitting device has a structure containing Sr₄Al₁₄O₂₅: an alkaline earth metal aluminate phosphor having a composition expressed by Eu as a main phosphor.

12. A dimming control system, having:

the one or more lighting fixtures of any one of claims 1 to 11, and an information processing device communicably connected to a dimming driver of the lighting fixture and adjusting illumination light of the lighting fixture in a range from a first temperature to a second temperature of correlated color temperature,

the information processing apparatus includes:

a dimming determination unit that determines a control command to the dimming driver in order to control the dimming driver to adjust the illumination light of the lighting fixture;

a transmission section that transmits the control command determined by the dimming determination section to the dimming driver;

the control range of the toning performed by the information processing device is included in a region surrounded by a straight line connecting the first temperature and the second temperature on the blackbody radiation locus and a set of points obtained with respect to all points on the straight line between the first temperature and the second temperature and located at a distance 2 times a distance from a point on the straight line to a point on the blackbody radiation locus at the same correlated color temperature as the point in a chromaticity diagram of the CIE1931 color system, and is included not in an outer frame of the region but in an inner side of the outer frame at least in any correlated color temperature between the first temperature and the second temperature.

13. A dimming control system, having:

the information processing apparatus includes:

the control range of the color mixing from the first temperature to the second temperature of the information processing device is within a color deviation of ± 0.001 in a chromaticity diagram of a CIE1931 color system.